Suspending Sector Erase From Flash Memory - Fujitsu 8FX Hardware Manual

CHAPTER 26 DUAL OPERATION FLASH MEMORY
26.5 Programming/Erasing Flash Memory
26.5.5

Suspending Sector Erase from Flash Memory

This section explains the procedure for entering the sector erase suspend
command to suspend sector erase from the Flash memory. Data can be read
from sectors not being erased.
■ Suspending Sector Erase from Flash Memory
• To suspend the Flash memory sector erase, send the sector erase suspend command
mentioned in the command sequence table from the CPU to the Flash memory.
• The sector erase suspend command suspends the current sector erase operation, allowing
data to be read from sectors that are not being erased.
• The sector erase suspend command is only enabled during the sector erase period including
the erase wait time; it is ignored in chip erasing or programming.
• The sector erase suspend command is executed when the sector erase suspend code (0xB0)
is written. Specify an address in the sector selected to be erased. If an attempt is made to
execute the sector erase suspend command again when sector erase has been suspended, the
new sector erase suspend command input is ignored.
• When a sector erase suspend command is input during the sector erase wait period, the
sector erase wait time ends immediately, the sector erase operation is stopped, and the Flash
memory enters the erase stop state.
• When a sector erase suspend command is input during sector erase after the sector erase
wait period, the erase suspend state occurs after a maximum of 35 µs has elapsed since the
issue of the sector erase suspend command.
Note:
To suspend sector erase by issuing a sector erase suspend command, issue the
command after 35 µs + 2 MCLK (machine clock) or longer has elapsed since the issue of
a sector erase command or a sector erase resume command.
To suspend sector erase command again after resuming sector erase by issuing a sector
erase resume command, issue the command after 2 ms or longer has elapsed since the
issue of the sector erase resume command.
556 FUJITSU SEMICONDUCTOR LIMITED
MB95630H Series
MN702-00009-2v0-E